Geometry

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Across
  1. 4. A plane figure with five straight sides and five angles
  2. 7. A four-sided figure
  3. 9. An eight-sided polygon
  4. 10. A ten-sided polygon
Down
  1. 1. An infinitely large flat surface
  2. 2. A quadrilateral with opposite sides parallel
  3. 3. A plane figure with at least three straight sides and angles
  4. 5. A six-sided polygon
  5. 6. A parallelogram that has four right angles and opposite sides are equal lengths
  6. 8. A parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides